Grinding-mill.



PATENTED JAN. 17, 1905.

J. H. HUBBBLL.

GRINDING MILL.

ON FILED FEB III III //////////4 No. 780,342. PATENTED JAN. 1'7, 1905.J. H. HUBBELL.

GRINDING MILL.

APPLICATION FILED FEB-17, 1904.

3 SEEETS-SHEBT 3.

Q Am IINiTEn STATES Patented January 17, 1905.

PATENT OFFICE.

JOSEPH H. HUBBELL, OF DAYTON, OHIO, ASSIGNOR TO BUCKEYE IRON & BRASSIVORKS, OF DAYTON, OHIO, A CORPORATION OF OHIO.

GRINDING-MILL...

SPECIFICATION forming part of Letters Patent No. 780,342, dated January17, 1905.

Application filed February 17, 1904. Serial No, 193,937.

To all whom it may concern.-

Be it known that I, JOSEPH H. HUBBELL, a citizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio, haveinvented new and useful Improvements in Grinding-Mills, of which thefollowing is a specification.

This invention relates to grinding-mills; and while I do not limitmyself to the use of the machine in any particular field I have found itof especial utility in breaking and granulating or pulverizing oil-cake,in which connection 1 will hereinafter describe the same.

Oil-cake is a by-product of linseed and cotton-seed after the oil ispressed from the meat thereof. These cakes are generally rectangular inshape and vary somewhat in thickness in different plants and are usedfor fertilizer and cattle-food. Ordinarily the oilcake is sacked andshipped in bulk; but there is agrowing demand for the ground product. Bymeans of that particular organization of the mill which I have selectedfor illustration in the accompanying drawings, forming a part of thisspecification, I am enabled to uniformly reduce the cakes to granular orpulvorulent condition and can effectively, rapidly, and economicallyhandle cakes of varying thicknesses in my machine. 9 Referring to saiddrawings, Figure 1 is a side elevation of a mill including my invention.Fig. 2 is a vertical sectional elevation of the same. Fig. 3 is anenlarged detail sectional view of part of a pair of grinding-rollshereinafter described, showing also the manner of separating the stock.Fig. 4 is a face view of a portion of one of said rolls and its Shaft.

As previously indicated, I illustrate in the drawings, to whichreference has just been made, one simple and convenient organization ofparts comprising my invention, which I will now set forth in detail; butI wish to state that I do not limit myself to the disclosure thus made,for material variations as to many features of the invention may beadopted within the scope of my claims.

The framing illustrated includes the side members 2, arranged invertical parallelism,

the base or bed 8, and the top 4. Each side member 2 is composed ofapproximately complemcntal plates, which may be formed in any desirableway and which abut, their abutting edges being flanged and bolted orotherwise suitably united. The terminal portions of the base 3, whichlatter may be in the form of a suitably-made plate, are recessed to receive the side members 2, the said recesses having squared end walls toform shoulders to abut against the corresponding portions of the saidside bars. In other words, the bottoms of the side members snugly fitthe recesses in the base. In like manner the terminal portions of thetop or crown plate I are similarly recessed to snugly receivecorrespondingly-shaped shoulders upon the upper portions of said sidemembers 2, the several parts constituting the frame being suitablyconnected together-as, for example, by means of bolts. hen said partsare constructed and assembled as illustrated and secured together, theresultant frame presents a stable solid structure.

The base 3 is adapted to rest upon a suitable foundation, while the sidemembers 2 constitute suitable supports for a plurality ofgrinding-rolls, hereinafter described. Said grinding-rolls, as will bepresently set forth, are arranged in staggered order in order tofacilitate the feed of the article to be ground through the mill. I haverepresented four of these rollers, although this number may be varied,said rollers being arranged in cooperating pairs, there being an upperpair, each of which is denoted by 5, and a lower pair, each of which isdenoted by 6. The upper pair of rolls preliminarily or initially actsupon the cotton-seed or linseed cake to coarsely separate it, while thelower pair grinds the previously-separated parts into finer particles,and as one roll of each pair, as will hereinafter be set forth, isadjustable with respect to its companion the grade of the product can bevaried. I will hereinafter describe the peculiar construction of theupper pair of rolls, said upper pair of rolls being so driven as tomaintain a like velocity of their working surfaces, although theopposite applies with respect to the lower rolls. By maintaining a likesurface speed of the upper rolls I am enabled to secure a thoroughbreaking up of the cake. The ends or journal portions of the shafts 7 ofthe four rolls are rotatively supported by bearing boxes or blocks 8,fitted in slots formed in the side members 2 of the framing. Theintermediate bearing boxes or blocks 8 snugly fit their slots that is tosay, they are held against vertical and horizontal motions; but the samedoes not apply to the terminal bearing-boxes. Said terminal-boxes,however,are held against side movement, although they can movevertically in their slots, the latter being deeper than the cooperatingboxes in order to provide for such vertical motion and the correspondingadjustment of the coacting rolls. In this way one roll in each case ismade adjustable toward and from its mate, whereby I can regulate thegrade of product or can compensate for cake which varies in thickness.The particular means illustrated for moving the terminal rolls to securethe adjustment described will be hereinafter set forth, as will drivingmechanism for obtaining alike surface motion of the upper rolls.

As previously set forth, the peripheral construction of the severalrolls is the same; but I will now describe in detail the peculiarfunction secured by the upper pair of rolls,

as well as the construction of said upper rolls.

Each upper roll is horizontally and transversely grooved or channeled,the series of channels being at right angles to each other and therespective walls thereof diverging toward the periphery of said roll, soas to form on said periphery or working surface a multiplicity ofsubstantially pyramidal projections or teeth 9, the teeth of coursebeing arranged in longitudinal rows, and between the rows of teeth Iform depressions or concavities 10, said depressions or concavities ofone roll being adapted to register with the projections of the otherroll as the said two upper rolls rotate. It will be seen that thesedepressions or concavities are arranged in alternation with the teeth ofthe respective rows. As previously stated, the surface speeds of the twosaid upper rolls, which, it will be perceived, are of uniform diameter,is uniform, whereby when the rolls operate a row of teeth on one rollwill press the stock or cake of cotton-seed or linseed into thedepressions or concavities of the other roll, and as the stock or cakeis pinched between the two rolls partially around the respectiveconcavities it is completely fractured or broken by the row of teeth,and owing to the number and uniform disposition of said teeth thethorough breaking up of the leading or advance edge of the cake or stockinto a multiplicity of pieces is assured. Each roll of course pressesthe stock into the concavities of the other roll, from which it will beapparent that the rolls work in alternation. After the stock isinitially broken or separated it is brought under the action of thelower rolls 6 and is further pulverized by them to the requisitefineness.

As previously stated, while the surface speed of the upper rolls is thesame such statement does not apply to the surface speed of the lowerrolls, one of them, as will hereinafter appear, having a greater surfacespeed than the other, which I obtain partly through the drivingmechanism and partly by making the lower one of the two lower rolls ofgreater diameter than its companion roll. The driving mechanismillustrated I will now describe.

Each shaft carries at its opposite ends toothed gears, as 11, arrangedin trains in proximity to the outer faces of the two side members 2, andone of the intermediate shafts 7 is shown as equipped at its oppositeends with power-transmitting members 12, which may be pulleys driven bybelting (not shown) from any desirable form of motor. I have onlyrepresented one of these power-transmitting members 12 in Figs. 1 and 2.When, therefore, the two pulleys or band-wheels are rotated, the severalrolls hereinbefore described will be simultaneously driven to put theminto action. The lowermost gears,which directly actuate the lowermostroll of the staggered series, hereinbefore described, haveless teeththan those of the gears next above the same, by reason of which, coupledwith the fact that the two lowermost rolls 6 are of different diameters,I am enabled to secure the desired relative surface speed of said twolowermost rolls, the surface speed of the lower one of said two beinggreater than that of the other one.

From the foregoing it will be understood that the machine contemplatestwo pairs of rolls adapted to successively operate upon the stock and ofdifferent grinding efiiciencies or grades, the final rolls being ofgreater grinding efficiency than the primary rolls, and as the saidfinal rolls have different surface speeds I am enabled to obtain a verydesirable product. By different grinding efficiencies I mean to say thatthe rolls are of different pitches. The top pair of rolls is of greateror coarser pitch than the bottom pair and as a matter of course willfeed the cake quicker. The top pair of rolls will not grind the cake tothat degree of fineness known as granulated no matter how closely theyare set, because their pitch is too coarsethat is to say, the peripheralprotuberances or projections are spaced too far apart. The pitch of thelower pair of rolls is finer than that of the upper pair, and hence thefinal rolls are of greater efficiency or they have a greater effect uponthe stock than the upper pair. The several clined hopper-board 13,suitably fastened between the framing side members 2, and onto which thecake or stock is initially delivered, said inclined hopper-boarddeliveringthe stock to the primary rolls 5, Where it is initiallyground. After the stock is separated or broken up by the said primaryrolls it falls in broken or separated condition onto the cant-board 1which directs the broken particles between the adjacent rolls 5 and 6,which further break such particles, which when further broken fall ontothe cant-board 15, which, like the other cant-board, is suitably securedbetween the said framing members 2. The cant-board 15 supplies thebroken particles to the lower rolls 6, Which pulverize said particles,the pulverized stock falling into a hopper formed by the boards 16,which converge toward an open* ing 17 in the bed or base 3, the twoboards, like the other ones, being also fastened between the framemembers 2. After passing through the opening 17 the finely-pulverizedmaterial can be disposed of as desired.

It will be remembered that the terminal blocks or boxes 8 of the rollshave been described as adjustable, the adjustments in the present casebeing in a vertical direction, and I have found the wedge means now tobe described for raising or lowering the adjustable boxes and formaintaining them in their desired shifted positions an entirelysatisfactory medium for securing such results.

Each bearing-box of the upper and lower rolls is shown as engaged uponits upper and lower sides by the straight faces of wedges, each denotedby 18, the angular faces thereof being arranged to engagecorrespondingly-angular faces upon the receptacles 19, forming part ofthe outer sides of the frame members 2, whereby upon moving the wedgeslongitudinally the uppermost or lowermost rolls cooperative therewithwill be raised or lowered in accordance with the direction that thewedges may be moved. By the adjustment of the rolls in the manner setforth I am enabled to break cakes of variable thicknesses and cangranulate or pulverize the product to different degrees of fineness.

By the organization hereinbefore described I am enabled to secure adesirable quality of work without the necessity of running the mill at ahigh speed, which is a desirable feature. The several parts 13, 14, 15,and 16 are connected to the framing side members by means of elongatedslot-and-pin joints, each denoted in a general way by 13, by means ofwhich said parts may be adjusted.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is-

1. In a mill of the class described, a pair of cooperative rotativerolls, each having peripheral teeth arranged in longitudinal rows anddepressions between the said rows, said depressions being separatedlongitudinally of the rolls and alternating laterally with the teeth ofthe respective rows, the depressions on one roll registering with theteeth of the other roll, on the rotation thereof.

2. In a mill of the class described, a pair of cooperative rotativerolls, each having peripheral teeth arranged in longitudinal rows anddepressions between the said rows, said depressions being separatedlongitudinally of the rolls and alternating laterally with the teeth ofthe respective rows, the depressions on one roll registering with theteeth of the other roll, on the rotation thereof, combined withmechanism for rotating said rolls at a uniform surface speed.

3. In a mill of the class described, a pair of cooperative rotativerolls, each having peripheral teeth arranged in longitudinal rows anddepressions between the said rows, said depressions being separatedlongitudinally of the rolls and alternating laterally with the teeth ofthe respective rows, the depressions on one roll registering with theteeth of the other roll, on the rotation thereof, combined with a secondpair of cooperative rolls to receive the stock from the first pair ofrolls.

a. In a mill of the class described, a pair of cooperating rotativerolls, each having peripheral teeth arranged in longitudinal rows, anddepressions between the rows, said depressions being separatedlongitudinally of the rolls and alternating laterally with the teeth ofthe respective rows, the depressions of one roll registering with theteeth of the other roll, on the rotation thereof, a second pair of rollsin position to receive the stock from said first pair of rolls, saidsecond pair of rolls also having peripheral teeth, and mechanism fordriving the first pair of rolls at a uniform surface speed and the otherrolls at a differential surface speed.

5. In a mill of the class described, a pair of cooperating rotary rolls,each having peripheral teeth arranged in longitudinal rows, anddepressions between the rows, said depressions being separatedlongitudinally of the rolls and alternating laterally with the teeth ofthe respective rows, and the depressions of one roll registering withthe teeth of the other roll, on the rotation thereof, and means foradjusting one of said rolls with respect to the other.

6. In a mill of the class described, a pair of cooperating rotary rolls,each having peripheral teeth arranged in longitudinal rows, anddepressions between the rows, said depressions being separatedlongitudinally of the rolls and alternating laterally with the teeth ofthe respective rows, and the depressions of one roll registering withthe teeth of the other roll, on the rotation thereof, a second pair ofrotary rolls in position to receive the stock from the first pair ofrolls, intermeshing toothed gears connected with the several rolls, oneof said gears having a less number of teeth than its cooperating gear,and means for positively driving one of the rolls.

7. In a mill of the class described, a pair of cooperative rotary rollseach having peripheral teeth arranged in longitudinal rows anddepressions between the rows, said depressions being separatedlongitudinally of the rolls and alternating laterally with the teeth ofthe respective rows and the depressions of one roll registering with theteeth of the other roll on the rotation thereof, a second pair of rollsin position to receive the stock from the first pair of rolls, and meansfor adjusting one roll of each pair with respect to its companion.

JOSEPH H. HUBBELL.

Witnesses:

FRED. F. RIKE, GEORGE F. HALE.

